Try turning off Suitcase or whatever font management you use, and reload the page. Then, if that works, reopen Suitcase and start disabling fonts. There may be a font, such as Helvetica Fractions, that is confusing Safari.
If that doesn’t work, you might need to scout ~/Library/Fonts for unnecessary stuff, or clean your “font caches,” either manually, or with a tool like Maintenance.
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